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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Dec. 31, 2011
Deferred Stock Units [Member]
Dec. 31, 2010
Deferred Stock Units [Member]
Dec. 31, 2011
Deferred Stock Units [Member]
Dec. 31, 2010
Deferred Stock Units [Member]
Jul. 21, 2009
Restricted Stock Units [Member]
Dec. 31, 2011
Employee Share Purchase Plan [Member]
Dec. 31, 2010
Employee Share Purchase Plan [Member]
Dec. 31, 2011
Employee Share Purchase Plan [Member]
Dec. 31, 2010
Employee Share Purchase Plan [Member]
Sep. 30, 2010
LTIP 1 [Member]
Jun. 30, 2009
LTIP 2 [Member]
Sep. 30, 2011
LTIP 2 [Member]
Jun. 30, 2010
LTIP 3 [Member]
Dec. 31, 2010
LTIP 4 [Member]
Dec. 31, 2010
LTIP 4 [Member]
Jun. 30, 2011
LTIP 4 [Member]
Dec. 31, 2011
LTIP 3 And LTIP 4 [Member]
Dec. 31, 2010
LTIP 3 And LTIP 4 [Member]
Dec. 31, 2011
LTIP 3 And LTIP 4 [Member]
Dec. 31, 2010
LTIP 3 And LTIP 4 [Member]
Jun. 30, 2010
Maximum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Maximum [Member]
LTIP 4 [Member]
Jun. 30, 2010
Minimum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Minimum [Member]
LTIP 4 [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]                                                          
Purchase of treasury stock (in shares)   264,834                                                      
Purchase of treasury stock   $ 12,500,000   $ 12,499,000                                                  
Common shares reissued         0                                                
Number of options outstanding 1,837,552   1,837,552   2,277,733                                                
Common shares were available for issuance 1,207,795   1,207,795                                                    
Vesting period of stock options (in years)     four                                                    
Minimum period (in years) for expiry of stock option     seven                                                    
Maximum period (in years) for expiry of stock option     ten                                                    
Unrecognized compensation cost relating to unvested stock awards 5,700,000   5,700,000                                                    
Unvested stock awards compensation cost, weighted average recognition period (years)     2                                                    
Awards settled in cash in the aggregate amount                             14,400,000   10,700,000                        
Cash received from employee stock purchase plan                     400,000 300,000 1,000,000 600,000                              
Cash proceeds from exercise of options granted 3,000,000 1,000,000 10,200,000 3,900,000                                                  
Tax benefit realized from exercise of options 400,000 200,000 800,000 1,100,000                                                  
Share-based payment awards granted           6,760 4,721 7,023 4,878 574,767                 264,834 264,834                  
Share-based payment awards granted, value                   $ 13.33                                      
LTIP equity plans, estimated award grant percentage against target                               100.00%   100.00%     100.00%         150.00% 150.00% 50.00% 50.00%
Compensation cost expensed during the period-LTIP equity plans                                           $ 2,400,000 $ 1,900,000 $ 6,300,000 $ 3,400,000